如何使用XmlHttpRequest和ASP.NET MVC處理文件上傳錯誤？

Question

為簡單起見：

客戶：

var xrh = new XmlHttpRequest();
...
xrh.onerror = on_upload_error;
xrh.send(...)

服務器：

public class file_transfer
{
    [HttpPost]
    public void Upload(HttpPostedFileBase[] files_to_upload)
    {
        ...
        if (succeeded)
        {
            // what should I to to let the client know the success? in onload
        }
        else
        {
            // what should I to to let the client know the failaure? maybe in onerror
        }
    }
}

我應該如何讓客戶知道成功？ 在加載？

我應該如何讓客戶知道失敗的原因？ 也許陷入錯誤？

Answer 1

您可以將http成功/失敗的代碼返回給客戶端：

[HttpPost]
public ActionResult Upload(HttpPostedFileBase[] files_to_upload)
{
    ...
    if (succeeded)
    {
        return new HttpStatusCodeResult(200);
    }
    else
    {
        return new HttpStatusCodeResult(400);
    }
}